CKDO (AM)
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| City | Oshawa, Ontario |
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| Branding | 107.7 FM & 1580 AM CKDO |
| Slogan | Durham's Classic Hits |
| Frequency | 1580 kHz (AM), 107.7 MHz (FM) |
| First air date | October 5, 1946 |
| Format | Oldies/Classic hits |
| Power | 10 kW(AM) |
| ERP | 2 kilowatts (FM) |
| HAAT | 86 meters (282 ft) (FM) |
| Class | A (both AM and FM) |
| Owner | Durham Radio Inc. |
| Website | www.ckdo.ca |
CKDO is a Canadian Class A clear-channel radio station, broadcasting at 1580 AM in Oshawa, Ontario. The station airs an oldies format. CKDO also has an FM rebroadcaster in Oshawa, CKDO-FM-1, at 107.7 FM. CKDO is one of only two radio stations in Canada that broadcast on 1580 AM; the other is CBPK, a 50 watt weather information station in Revelstoke, British Columbia.
CKDO was launched in 1946 by T. W. Elliott, an executive with the Canadian division of General Motors. Its original frequency was 1240.
In 1950, Elliott sold the station to Lakeland Broadcasting, who adopted the new callsign CKLB. The station moved to AM 1350 in 1956. The following year, Lakeland launched an FM sister station, CKLB-FM. In 1979, the stations were acquired by Grant Broadcasting, and CKLB adopted the new call sign CKAR. (The former CKAR call sign is now used at a radio station in Huntsville, Ontario).
In 1990, Grant Broadcasting sold the stations to Power Broadcasting. In 1992, Power readopted the station's original CKDO calls and its current format. In 1996, the station moved to an adult contemporary format, sometimes simulcasting the programming of its FM sister station and other times airing its own distinct programming schedule.
In 2000, Corus Entertainment acquired the stations. In February 2001, Corus converted CKDO to its short-lived talk radio network (also consisting of CHML in Hamilton, CFPL in London, CKRU in Peterborough, CFFX in Kingston and CJOY in Guelph), but the station returned to the oldies format by the summer of that year.
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